package com.atguigu.gulimall.order.config;

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

@Configuration
public class MyRequestConfig {


    /**
     * 只要有 远程调用 就会先通过 请求拦截器
     * @return
     */
    @Bean
    public RequestInterceptor requestInterceptor(){
       return new RequestInterceptor() {
           @Override
           public void apply(RequestTemplate requestTemplate) {
               //1、使用RequestContextHolder拿到刚进来的请求数据
               ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

               if (requestAttributes != null) {
                   //老请求
                   HttpServletRequest request = requestAttributes.getRequest();

                   if (request != null) {
                       //2、同步请求头的数据（主要是cookie）
                       //把老请求的cookie值放到新请求上来，进行一个同步
                       String cookie = request.getHeader("Cookie");
                       requestTemplate.header("Cookie", cookie);
                   }
               }
           }
       };
   }



}
